import java.io.*;
import java.util.Scanner;

//进行普通文件的复制
public class IODemo7 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入要复制的源文件: ");
        String srcPath = scanner.next();
        System.out.println("请输入要复制的目标文件: ");
        String destPath = scanner.next();

        // 合法性判定
        // 1) srcPath 对应的文件是否存在
        File srcFile = new File(srcPath);
        if (!srcFile.isFile()) {
            System.out.println("源文件路径有误!");
            return;
        }
        // 2) destPath 不要求对应的文件存在, 但是目录得存在.
        File destFile = new File(destPath);
        if (!destFile.getParentFile().isDirectory()) {
            System.out.println("目标路径有误!");
            return;
        }

        // 复制操作
        try (InputStream inputStream = new FileInputStream(srcFile);
             OutputStream outputStream = new FileOutputStream(destFile)) {
            while (true) {
                byte[] buffer = new byte[1024];
                int n = inputStream.read(buffer);
                if (n == -1) {
                    // 读取完毕
                    break;
                }
                // 把读到的内容写入到 outputStream 中
                outputStream.write(buffer, 0, n);
            }
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        System.out.println("复制已完成");
    }


}
